Superheater for locomotive-boilers.



W. SCHMIDT @L P. THOMSBN.

SUPERHEATER FOR LOUOMOTIVE BOILERS.

' MPLIGATION FILED Anw, 1910 W. SCHMIDT j?. THOMSEN.

SUPERHEATER FOR LOCOMOTVE BOILERS.

APPLIQATIGH FILED APB. 2a, 1910,

la EL M@ Patented im, 2?, 1914.

WIT/VESSES .WZ/ENTURS,

Para@ nio/15am l large diameter than when the diameter' is ma-sisme@ this @he reisinjng smoke- ,boiler should lieve the largest possiblejnum-fcontraction, also, nialre it. much more dil- .trs ere'expanded into thesame tube sheet the normal and regular smoke tube of the usual 'constructing the entire boiler as 'is usually sTATEs-rnrnnr onzsien winmix SGHMIDT'AND rum ,T'I tllisltiv-olfoAss'nLv-wnnnnrnsso H.

essmnons To, sonmnmsons mssDAMPF-omnmsonerr is. 5 cess i WILBnLMsHHE, GERMANLA- CORPORTION or GERMANY. l

elle!" 'surenen's'rnfron Loooo'rIvn-sornnns e saecineatnsn bf tenis raten.

:Annarita-mea sprites, 1910. serialize. 558,112.

, group the superlieater' loops and to so er- 'range such ends as go to the steam headers as to enable individual superlieater elements l(or units) to A'be conveniently inserted and removed; also. so that s convenient and in ltercliangeeblerfastening means maybe employed for attaeiiing said ends to tile steam 1 collectors; also, so course or" 'Vue 'steam through individual el nente or i be'ieedily and quie iced joints quickly located in cese of or for @tirer purposes. 4

'l r"still further object of our invention is to nrovide-- a grouping of superlieeter loops and on arrangement of their ends so that the 'ends ofthe smoke tubes, as they join the tube Sheet' of the smoke box, are fairly ree from obstruction and open to inspection.

To ZZZ t may eoncern':

123e fit known that'we, Wunnnm `SoHMin'r and'lPnrsn lfnoiusniv, both subjects of the 'residents 'o Cassel-Wilh'elmshhe, Germany, have invented certain new andv useful 1111-' provenints in Superheates for Locomotive- Bo'ilers, oil which the'- followin'gjis :s specifi'- l l@ur inventionreiates to'looomot'ivefsuperlieeters of the general. character disclosed in variom's patents previously issued to'eusg or one of Y us', `'oominorityn'spoken of as smoke' tube 'superiieat'ers, in which `-`1s1`1perheater tubes'aie'a'rranged in the smoke tubes :('re tubes?) through vvliioh 'the furnacev gases are cerri'ed. Generally tli'ese'superheater; tubes haveiben placed. in'special smoke tubes of tubes thereby-requiring the'ffboiler to` be specially. built 4for the purpos'eat'a substsn tially increased .'cost. 'Not only this" but, Whereas to secure Amaximum veiciency' fa tion proceeds.

any number of smoke tubes may be used to .inclose superlieater loops u to the total Humber of smoke tubes embodied in the boiler-,the individual superi/mater loops may bemadesliorter than usuel, so that the return bends thereof may be placed in e cooler .part'of the smoke tube; in this ive-y seid bends areless liable. toburn ont. This also renders unnecessary the use of a damper or equivalent means to out olf the liowof hot gaseswhen the boiler is rst started up or when engine is running with steam shut oil.

Still another advantage gained by our present improved construction is a' simple arrangement of steam hesde'rswvhicli is compact and out of the wey and in which Cooling of tlie superlieated steam header by reason of proximity of the saturated Steam header may be minimized.

Referring to the drawingse Figure l represents a 'transverse section through one bali of the smoke bots of a locomotive equipped with e preferred form of our improvement herein described; Fig. i3 represents liorizontal section along the line 2-2 of Fig. l; Fig.' 3 is o detail, part section, showing several groups of superlieeter loops errenged according to e modified form oi'our invention; Figui represents a section along the line 4- 4 0I Fig. 3; F 5 is a view similar to Fig. 3,-repre'senting still ani/her modifi- (mision of our invention and Fig. 6 is a secloer of jsmoke tubes ofthe thinnest'poss'ibld material, these larger diametered smoke'- tubes are necessarily fewer' in number Aandof considerably heavier gage. Expansion and cult to maintein ltightjoints between the' smoketubes :and the tube-sheets into which they are expanded where the former 'are ofA small. And, when tubes of diierent diameunequal expansion of the diierent sized tubes constitutes an obstacle to the maintenence'of tight joints. o f- The object ofour present invention is to provide an arrangement of the superheater tubes 'or'loops suclitliat th'eymaybe plaoed'in the locomotive so thatno special -preliminary construction is requiredend as many or as few smoke tubes may be occupied as desired. Such e construction is ofiadvantage not only in connection with new locomotives,l but in connection with old non-superheater locomotives which can. thus" read1ly have asuperheater incorporated 'with them without re'- Inecessary in epplying `superheaters of this class to the olderf''1ooomot1ve's. further-'object of our invention is to so 'T jA Intherornstruction herein described, since tion along the line 6-6 of Eigw; Fig. i is "ententes oet. er, rese,

- Gther objects will appear es the specicen l (ill f lector Z is the saturated steam header and receives steam from the boiler by means of pipe f, while e is the superheated steam collector. The superheater consists of 12 rows of superheating loops g, which are arranged in 12 rows of smoke tubes, three tubes in each row bein used for the purpose. Each superheating oop g is U-shaped and the two ends thereof are connected respectively to the saturated and superheated steam colleetors Z and e so that all the loops are parallel; The arrows, Fig. 2, show the course of the steam through said superheater loops. In bringing out the ends of the superheater loops of the two top rows, it will be noticed that these ends l'ie in and connect to the two steam `collectors in one and the same pla-ne and that this plane is the meridian plane of the top row. In the same way the ends belonging to the element-s of the third and fourth rows lie in a single plane and-this plane is the 'meridian plane of the fourth row. In this way a very generous vertical distance is,obtained between the ends of the superheaterloops as they join the steam headers so that we have suflicient room to utilize a connecting clamp L provided with an intermediate screw bolt and nut h the ends of said bolts being forked to rest upon the terminal disks i into o-ne of which each superheater element end is expanded. The same scheme is used for the remaining rows of superheater elements. By thus arranging the rows of connecting points of super-heater elements and steam headers at these considerable distances apart and thereby using the long clamp pieces h, we are able to make these pieces strong and substantial; they are also very accessible and easily removed individually. The attaching bolts and their nuts it are also easily gotten at.

It will 'be noted that the superheater loop ends which are in one plane (the ends coming from two adjacent rows of smoke tubes) are vertically in line with the corresponding ends coming from every other set of two smoke tube rows. Thus all the ends from the diderent pairs of rows which go .to the superheated steam collector are arranged vertically as to one another, and similarly as to theends which go to the saturated steam collector.` This permits the use of steam collectors of a simple rectangular section and thereby reduces the cost of manufacture; heat losses in the collectors 'for the last four rows of smoke tubes.

are also reduced since there is a minimum number of separate lwalls between saturated and superheated steam collectors.

In the modification shown by Figs. 3 and 4 each individual superheater element or unit consists of two U-shaped loops arranged in series in adjacent smoke tubes belonging` to two neighboring smoke tube rows. 'Heren the steam4 collectors are not cast in one piece (as in Figs. 1 and 2), but comprise separate castings between which' may be left an air space; orif preferred, a heat insulating medium may be inserted sofas to diminish any flow of heat from the superheated steam collector to the saturated steam collector and consequent cooling of the superheated steam.

Figs. 5 and 6 show still another arrangement in which the smoke tubes are placed one above the other, instead of staggered as in the previous igures. I-Iere the plane in which the superheater unit ends are carried out is midQway between the rows of smoke tubes. Each superheater unit consists of two U-tubes, invertically adjacent smoke tubes, arranged in series. In this modification the rows of superheater element ends are equidistant, althoughV since the smoke tubes are necessarily farther apart than when staggered, the actual distance between the planes of these ends may be the same so that connecting clamps 'L may be used of the same length as in the arrangement shown in Figs. 1 4. Y

Figs. 7 to 9 show still another modicationof our invention. Here each superheating unit consists of two U-tubes arranged in seriesin two smoke tubes in the same vertical line but in 'rows separated by an intervening row. The two ends are carried vertically away from one another instead of toward one another as in Fig. 5, e. g. This makes it possible to bring out the -sat` urated steam ends ofthe superheating elements belonging to the four top rows of smoke tubes in one plane and all hof the corresponding superheated steam ends in another plane. The same may be done for the next four rows of smoke tubes and again The steam collectors are then arrangedas one casting containing four chambers in which the saturated steam and superhcated steam is: alternated. rThus in Fig. 7, n is ,a saturated steam collector and m' a superheated steam collector. In this way each of the inner pairs of central planes'containing superheater element `vends employ-JA common steam chambers. f

The modification shown in Figs. 7 to 9 has a further advantage over the previously described forms in that the/saturated steam end and the superhe'ated steam end of each complete superheating unit lie vertically one. above the other. Each connecting clam):` '/z,

missie y therefore, serves to ooinpletelyv clamp and hold in position one complete superbeater unit, which may, consequently, be removed or replaced at once by simply nnscrewing the one nut ottbat particular clamp.

It should be understood that we have described herein only one-bali of tbe boiler. The other half would be identically the saine as tbe half shown so that tbe boiler as a Whole would have 'an identical system of steam collectors on each side with groups of superheater pipes separated along tbe Vertical center line of tbe boiler and joined to said collectors.

We claim:

l. In combination with' a locomotive boiler provided with smoke tubes, a superbeater comprising a plurality of unit-s constituted of loopsarranged in said tubes all the ends of said units belonging to a plurality of smolre tube rows being bent into a common plane and, in said plane, tbe saturated steam ends and the superbeated steam-ends being arranged in two separate groups.

In combination with a looornotiif boiler pro vided with smoke tubes, a. superheater comprising a plurality of units eaeb constituted ot a plurality of loops arranged in, said tubes all tbe ends o1c said units belonging to a plurality of smoke tube rows being bent into a common plane, and, in said plane, tbe saturated steam ends andthe superlieated steam ends being arranged in two separate groups.

3. ln combination with a locomotive vboiler provided with smoke tubes, a superheater comprising units yeaeb constituted of single U shaped loops arranged, one loop to a tube, in said tubes all the ends oi? said units belonging to a plurality oi-sinolre tube rows being bent into a common plane and, in said plane, the saturated steam ends and the superbeated steam ends being arranged in two separate groups.

l. InV combination with a locomotive boiler provided with a plurality of grouped rows of sinolre tubes, a superlieater comprising units constituted of loops arranged in said tubes, the ends of said units belonging to eaeb different group of sniolre tube rows being bent into a common plane in wbiob plane tbe saturated steam ,ends and tbe su perbeated steain ends are arranged in two separate groups said planes being, nrtber, alternately remote' from and closely adjacent to one another.

5. In combination uitl a loeoinotir boiler provided with a plurality of smoke tubes, a superlieater comprising units constituted of loops arranged in said tubes, all f the ends ofsaid units belonging to a plurality of sinolre tube rows being bent int-o a pair of common planes substantially par longing to a plurality of smoke tube rows.

being bent into a pair of Common planes substantially parallel to 'the planes of said smoke tube rows of which one plane contains ally tbe saturated steam ends tbe other plane all tbe superbeated' stes-1n ende.'v

Y. ln combination with a locomotive boiler provided with a plurality of smoke tubes, a superbeater comprising units constituted of loops arranged in said tubes, tbe ends of said units being bent into a number of common planes in such a manner pairs oic planes oi' saturated steam ends alternate with pairs of planes of superbeated steain ends.

8. ln combination Witn a locomotive boiler provided with a plurality of sfnolre e tubes, a superlieater comprising unitsv oonstituted of loops arranged in said tubes, tbe ends of said units being bent into a number or1 common planes in suoli a manner that pairs of planes of saturated steam ends ab tornate with pairs of planes osuperbeated .steam ends the distance between said being, further, substantially@ greater than the distance between the members of av pair.

ln testimony Wliereoii we nave hereunto set our bands in tbe presence two subscribing witnesses.

Witnesses Beaton-'r Donrrnorr, GUsTAV Rimase. 

